Contents
Key Stage 4 Foundation
Meaning
Auxin is a plant hormone that causes plant cells to elongate.
About Auxin
- Auxin is photophobic so it will build up on the darker side of a plant. This causes cells on the shaded side of a plant to elongate, bending a shoot towards the source of light.
- Auxin is found in high concentrations in shoot tips.
Key Stage 4 Higher
Meaning
Auxin is a plant hormone that causes plant cells to elongate.
About Auxin
- Auxin is photophobic so it will build up on the darker side of a plant. This causes cells on the shaded side of a plant to elongate, bending a shoot towards the source of light.
- Auxin is found in high concentrations in shoot tips.
Using Auxin
- Gardeners use auxin to encourage cuttings of plants to grow new roots when they are planted.
- Auxin can be used to kill plants by causing them to grow too fast, using up their stores of energy. Since auxin is sprayed on leaves, plants with larger leaves will absorb more and are more likely to die.
References
AQA
- Auxin, page 220-5, GCSE Biology; Student Book, Collins, AQA
- Auxin, pages 176-179, GCSE Biology; Third Edition, Oxford University Press, AQA
- Auxins, pages 170-3, GCSE Biology, Hodder, AQA
- Auxins, pages 236, 237, 239, 240, GCSE Biology, CGP, AQA
- Auxins, pages 81, 82, GCSE Biology; The Revision Guide, CGP, AQA
Edexcel
- Auxins, page 136, GCSE Biology, Pearson, Edexcel
- Auxins, pages 215-218, GCSE Biology, CGP, Edexcel
- Auxins, pages 74, 75, GCSE Biology; The Revision Guide, CGP, Edexcel